Reservoir evaluation is the aim of reservoirs description．The gray reservoir integrat— ed evaluation technique is a new means that is used to classify reservoirs by combining the gray correlative analysis and fuzzy mathimatics．Many parameters and indices of different reservoir classifications can be found in the schedule of company standards and they can be modified to correspond to the actual situation of the oil field．The parameter weights of various indices and parameters for the evaluation rseuhs also can be obtained by the expert’S experience．By means of computer processing，the evaluation’type at any point or grid block can be obtained in the three-dimensional space．This technique has successfully guided the practice of oil field development and yielded good results in application．